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- Aug 5, 2017
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Not a big fan of buying fish online, I haven't had much luck with that at all. The size of the fish is what determines the tank size it needs, yeah? Especially if its captive bred like you said before, so it doesn't know or need what a wild caught one does. So whats the difference between a captive bred fish that's less than two inches and a different captive bred fish that's slightly over two inches, say a damsel or chromis with multiple in the same tank? realistically, there isn't a difference, and there's no possible way to say any one fish is gonna grow at a certain rate or be a certain size full grown because it's common for other fish of the same species to. It's a crap shoot on each individual fish, which brings us to that factor. Every single fish has different requirements, preferences, and personality traits, again, with no possible way to predetermining what those are. Sure there are some necessities for different fish species, but even then those can be very altered and still work out just fine. I'm not trying to argue or be a dick, I'm just saying there are endless possibilities and not just one true way to run an aquarium.
The size of the fish is not the only factor that determines the tank it needs. Fin shape also tells you if they are an open water swimmer. Yellow tangs are herbivores and graze regularly, you cannot provide that in a 10 gallon tank. You cannot provide that in a 65 gallon tank. The size they can reach is very important. I have seen a 29 gallon bio cube significantly deteriorate a yellow tang. What you are doing is a poor choice and you probably guessed from the responses. That doesn't mean you can't do it. If the $20 price tag is your motivating factor and not the welfare of the animals, then this hobby is going to be very tough on you. This forum will probably be no different.